intelligence and now new warnings from the united states all the way up to president obama about a red line on the use of chemical weapons? >> well, the regime has historically denied that it would use any sort of chemical weapons against its own population, but that is something of an empty promise, at least from the perspective of everyone we have been speaking to about this. many of those fighters that we talked on the ground do say they do believe the greater the stranglehold they have on regime forces in the city of aleppo grows, the greater the likelihood is that in a desperate attempt to somehow either regain control or wreak mass havoc on the population, the regime would not hesitate when it comes to employing these types of weapons. and of course, when it does come to chemical warfare, there is very little if anything anyone here can do to protect themselves against that. >> well, that was to follow. do they have any defenses, are there any defenses and what are they doing to prepare for the prospect if they think that it's real? >> reporter: they have nothing. they have absol